Directions

In a food processor or blender combine onion, lime juice, cumin, garlic, ground chipotle pepper, and salt. Cover and process or blend to form a thick paste.

Spread paste over both sides of skirt steak; rub in with your fingers. Place skirt steak in a large resealable plastic bag set in a shallow dish; seal bag. Marinate in the refrigerator for 2 to 24 hours.